The UP INVINCIBLE High-Performance Street & Off-Road Brake Rotors utilize a high-strength iron rotor with a 2pc 6061 aluminum hat and motorsports-grade hardware specifically designed to withstand extreme conditions of a nearly-7000lb, 800+hp truck in street, track, off-road and towing scenarios. This system serves to help keep brakes cooler and additionally to reduce crucial unsprung weight and rotational mass.